प्रयागराज एक्सप्रेस - जो भी हो तुम खुदा की कसम; लाजवाब हो

Here is a list of the longest trains of each zone, where the entire run is in that zone itself i.e. the originating station, terminating station and all the intermediate stations are all in one zone.
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I have done the list to the best of my knowledge. If there are any corrections, please comment. Thanks.
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NR ------ 12237 --------- Varanasi Junction – Jammu Tawi ========= 1260 Kms. (Begampura SF Express)
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SCR ---- 17621 ---------- Aurangabad – Renigunta Junction ======== 1158 Kms.
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SR ---- 16127 ----------- Chennai Egmore – Guruvayur =========== 1098 Kms. (Guruvayur Express)
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WR ----- 22945 -------- Mumbai Central – Okha =============== 991 Kms. (Saurashtra Mail)
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CR ------ 12135 --------- Pune Junction – Nagpur Junction ========== 890 Kms. (Also__12139-Slip – CSTM - BPQ = 889.3 Kms)
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ECoR ----- 18448 ------- Jagdalpur – Bhubaneswar ============== 786 Kms. (Hirakhand Express)
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WCR ----- 11272 ------- Bhopal Junction – Itarsi Junction ========== 737 Kms. (Vindhyachal Express)
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NWR ----- 12467 ------ Jaisalmer – Jaipur Junction ============== 698 Kms. (Leelan SF Express)
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SWR --- 17325 ------ Hubballi Junction – Mysuru Junction =========== 608 Kms. (Vishwamanava Express)
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NFR ----- 15928 --------- New Tinsukia Junction – Rangiya Junction ===== 596 Kms.
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ECR ----- 23347 --------- Singrauli – Patna Junction ================ 480 Kms. (Link Express)
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SECR ---- 18241 --------- Durg Junction – Ambikapur =============== 468 Kms.
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ER ----- 13071 ---------- Howrah Junction – Jamalpur Junction ======== 467 Kms.
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SER ----- 58026 ---------- Hatia – Kharagpur Junction = =============335 Kms.
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NCR ----- 54161 ---------- Khajuraho – Kanpur Central ============== 261 Kms.
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KR ------ 50102 ----------- Madgaon Junction – Ratnagiri ============== 236 Kms.
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NER ----- 15111 ---------- Chappra Junction – Varanasi City ============ 224 Kms.
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